diff --git a/server/include/hooks.h b/server/include/hooks.h
index 4a2874f01..55ece2ced 100644
--- a/server/include/hooks.h
+++ b/server/include/hooks.h
@@ -19,6 +19,8 @@
 #ifndef _HOOKS_H_
 #define _HOOKS_H_
 
+#include <time.h>
+
 /* The configuration of hook parameters is done in "config.h" */
 
 struct msg;
@@ -28,10 +30,11 @@ struct path;
  *
  * @param m The last message which has been received
  * @param p The path which is processing this message.
+ * @param ts The timestamp when the message(s) were received.
  * @retval 0 Success. Continue processing and forwarding the message.
  * @retval <0 Error. Drop the message.
  */
-typedef int (*hook_cb_t)(struct msg *m, struct path *p);
+typedef int (*hook_cb_t)(struct msg *m, struct path *p, struct timespec *ts);
 
 /** This is a static list of available hooks.
  *
@@ -52,21 +55,21 @@ struct hook_id {
 hook_cb_t hook_lookup(const char *name);
 
 /** Example hook: Print the message. */
-int hook_print(struct msg *m, struct path *p);
+int hook_print(struct msg *m, struct path *p, struct timespec *ts);
 
 /** Example hook: Drop messages. */
-int hook_decimate(struct msg *m, struct path *p);
+int hook_decimate(struct msg *m, struct path *p, struct timespec *ts);
 
 /** Example hook: Convert the message values to fixed precision. */
-int hook_tofixed(struct msg *m, struct path *p);
+int hook_tofixed(struct msg *m, struct path *p, struct timespec *ts);
 
-/** Example hook: add timestamp to message. */
-int hook_ts(struct msg *m, struct path *p);
+/** Example hook: overwrite timestamp of message. */
+int hook_ts(struct msg *m, struct path *p, struct timespec *ts);
 
 /** Example hook: Finite-Impulse-Response (FIR) filter. */
-int hook_fir(struct msg *m, struct path *p);
+int hook_fir(struct msg *m, struct path *p, struct timespec *ts);
 
 /** Example hook: Discrete Fourier Transform */
-int hook_dft(struct msg *m, struct path *p);
+int hook_dft(struct msg *m, struct path *p, struct timespec *ts);
 
 #endif /** _HOOKS_H_ @} */
diff --git a/server/src/hooks.c b/server/src/hooks.c
index ec0330cb8..90342f575 100644
--- a/server/src/hooks.c
+++ b/server/src/hooks.c
@@ -48,7 +48,7 @@ hook_cb_t hook_lookup(const char *name)
 	return NULL; /* No matching hook was found */
 }
  
-int hook_print(struct msg *m, struct path *p)
+int hook_print(struct msg *m, struct path *p, struct timespec *ts)
 {
 	/* Print every message once to stdout */
 	msg_fprint(stdout, m);
@@ -56,7 +56,7 @@ int hook_print(struct msg *m, struct path *p)
 	return 0;
 }
 
-int hook_tofixed(struct msg *m, struct path *p)
+int hook_tofixed(struct msg *m, struct path *p, struct timespec *ts)
 {
 	for (int i=0; i<m->length; i++) {
 		m->data[i].i = m->data[i].f * 1e3; 
@@ -65,7 +65,7 @@ int hook_tofixed(struct msg *m, struct path *p)
 	return 0;
 }
 
-int hook_ts(struct msg *m, struct path *p)
+int hook_ts(struct msg *m, struct path *p, struct timespec *ts)
 {
 	struct timespec *ts = (struct timespec *) &m->data[HOOK_TS_INDEX];
 	
@@ -74,7 +74,7 @@ int hook_ts(struct msg *m, struct path *p)
 	return 0;
 }
 
-int hook_fir(struct msg *m, struct path *p)
+int hook_fir(struct msg *m, struct path *p, struct timespec *ts)
 {
 	/** Simple FIR-LP: F_s = 1kHz, F_pass = 100 Hz, F_block = 300
 	 * Tip: Use MATLAB's filter design tool and export coefficients
@@ -102,14 +102,14 @@ int hook_fir(struct msg *m, struct path *p)
 	return 0;
 }
 
-int hook_decimate(struct msg *m, struct path *p)
+int hook_decimate(struct msg *m, struct path *p, struct timespec *ts)
 {
 	/* Only sent every HOOK_DECIMATE_RATIO'th message */
 	return m->sequence % HOOK_DECIMATE_RATIO;
 }
 
 /** @todo Implement */
-int hook_dft(struct msg *m, struct path *p)
+int hook_dft(struct msg *m, struct path *p, struct timespec *ts)
 {
 	return 0;
 }
\ No newline at end of file